wilson



(No Model.) 2 Sheets-Sheet .1.

0. WILSON & J. s. FOSTER. ELLIPSOGRAPH.

N0.'386,619. Patented Ju1 '24', 188-8.

BEST AVAILABLE COP! u. mans mwm nw. WWO". n. z;

(No Model.) v2 Sheets-Sheet 2.

0. WILSON"& J. S. FOSTER. I

B LLIPSOGRAPH.

No. 386,619, Patented July 24, 1888.

BEST AVAILABLE COP? 814111244X on 620% W020,

N. FUERS. moumw wam tm In;

'sides and D D represent inward-extending BEST AVAILABLE cos.

UNITED STAT S PATENT Orrtcs.

HLES vVI SON AND JOHN S. FOSTER, OF ROGKPORT, hiztINlC.

, EttiPsoeeAa -i.

BCIPICATION iozmiztg'part of Letters Patent No. 386,619, dated duty as, 1889-.

i Application filed January 1:), X888. Serial No. 160,693.. (No model.)

the following is a speck-treaties.

Our invention relates to improvements in ellipsographs; and it has for its object to provide a device which may he used either as an ellipsograph or as a heam-compassf With this object in view the invention consists in a certain novel construction and arrangement of devices, which is fully set forth hereinafter in connection with the accompanying drawings, wherein- Figure l is a perspective view of the device. Fig. 2 is a side view, partly in'section, of the same. Fig. 3 is a detail view of one of the slides. Fig. 4 is a similar view or the adjustable post. Fig. -5 is a sectional view on the line a: a: of Fig. 2.

Referring by letter to the drawings, A designates the trammel consisting of the crossed bars B B, having grooves C G in their upper flanges which reach partly over the said grooves. I

E and E represent, respectively, the slides which operate in the said grooves, and they are provided on their upper'sides with the vertical spindles F F, which operate between the flanges D D. The slide E is provided with a tapped aperture, G, near one end, which aligns with a socket, H, in the grooved bar,

- when the spindle F is exactly at the intersection of lines drawn through the centers of the grooves 13. A set-screw, I, is arranged in the aperture G, and it is adapted to engage the socket H to lock theslide E rigidly in position.

K represents the beam, which is provided at its inner end with a rigid vertical post, L,

' having a socket, M, in its lower end to receive and rotateon the spindle E. This beam, as

will be seen, is graduated for a'purpose, w hich will be readily understood by those acquainted with the art, An adjustable post, N, is pro vided'with a socket, 0, in its lower end, which fits and rotateson the spindle F, and thepost slides longitudinally on the beam. A setscrew, P, is secured in the side of the post to enable the latter to be adjusted at any point in the length of the heath.

R- represents the pencil-slide, which is provided with a socket, S, for the pencil T, and

is also provided with a set-screw, U, to enable the slide tobe adjusted desired on tnchcam.

The outer end of the beam is provided with an integral pin, V, and the extensionhar it" is provided in its inner end with a socket, X, '5

to receive the said pin. It will he that the pencil-slide may be moved outward and adjusted on theextension bar, which the same size and shape as the beam.

The operation of this device as an ellipse graph will bereadily understood, and therefore there will he no necessity for a further de scription thereof herein. When it is desired to use the device as hcamcompass, remove the adjustable post from the beam, move the slide E to the intersection of the grooves,and secure it in the place in the manner hczeiuhefore described. The r igid post is now capablcf rotary movement around the spindle F, butthe latter is fixed j rigidly inposition. Thereiorqwhen theheam is moved around the spindle as a center, the pencil which is attached to the slide 1t dc scribes a circle. This change from an ellipse graph to a beam compass is very readily and quickly accomplished, and the means whieh H. being formed in the base ofone ot' t'he ways near the point of intersection of the trays, the slides E E, fitted in the ways and provided with the spindles FF, the slide E being further provided with a tapped aperture, G, adapted to align with the socket H when the said slide is at the point of intersection of the ways, a set-screw mounted in said aperture and adapted to'engage the socket H, the beam BEST AVAILABLE COP:

X, having a rigid post, T, at, its inner end provided with :1 socket-fitting 0n the spindle F, the beam being provided at its outer end with a pin, V, the extension-beam having asoekeb t0 fit over said pin V, the post N, adjnsinlny mounted on the beam and having a socket in its lower end fitting over the spindle F, and the pencil-slide adjustably mounted on .the beam and pmvidmiwith a. socket, S, for the 10 pencil, and :1 lateral Set-screw entering said Bucket, to secure the peneii, substantially as specified.

In testimony that we claim the foregoing as our own we have hereto aiiixed our signatures in presence of two witnesses.

CHA? LES 'WILSON. JOE FOS'lER. Nilnesses:

-I'. Annmcws, (J. vI. i-innlhi'zns. 

